hi,
see there is no specific courses is available only named as bio science, but there is many courses available which is closely related with biological sciences ,some if the course I have mentioned below,
bsc in zoology
bsc in microbiology
bsc in biotechnology
bsc in biochemistry
your score is decent and have fair chances in tier 1 colleges in kolkata in above mention courses,
I have mention some of the college name in which you should apply,
ashutosh college
schotish charge college
presidency university
jaypuria college
garis Andrews college
st Paul's college
netaji nagar dey college
ballyganj science college
Hope it would help.